Fe^0/GAC-Fenton工艺对煤化工废水的深度处理研究

Advanced Treatment of Coal-chemical Industry Wastewater by Fe^0/GAC-Fenton Process

采用Fe^0/GAC-Fenton串联工艺对煤化工生化出水进行深度处理,并对处理效能进行了分析。结果表明,在进水COD为290~330 mg/L的条件下,Fe^0/GAC微电解的最佳进水p H值为3、HRT为1.5 h、m_(Fe)/m_(GAC)为2(质量比)、气水比为3,此条件下微电解对COD的平均去除率可以达到46%,出水p H值在4.85~5.20之间;微电解出水补加亚铁的Fenton反应最佳进水p H值为5、n(H_2O_2)/n(Fe^(2+))为2(物质的量之比)、H_2O_2(30%)投加量为1.0 m L/L、HRT为1.0 h,此条件下Fenton反应对COD的平均去除率可达到39%。组合工艺对COD的总去除率为66%,出水COD在106 mg/L左右,处理成本为2.95元/m^3。

The advanced treatment of biochemical effluent of coal-chemical industry using Fe^0/GAC-Fenton tandem process was studied. The results showed that the Fe^0/GAC reached an optimum condition in which the average removal rate of COD was 46% and the effluent p H value was between4. 85 and 5. 20,when the influent COD concentration was 290-330 mg/L,p H was 3,HRT was 1. 5 h,m_(Fe)/m_(GAC) was 2,and gas/water ratio was 3; when the influent p H was 5,n( H_2O_2)/n(Fe^(2+)) was 2,H_2O_2(30%) dosage was 1. 0 m L/L,HRT was 1. 0 h,the Fenton oxidation of micro-electrolysis effluent with addition of ferrous reached optimum operating conditions,in which the average removal rate of COD was 39%. The total removal rate of COD reached 66%,the effluent COD was around 106 mg/L,and the cost of advanced treatment was 2. 95 yuan/m^3.